Cyclist&#39;s ribbed helmet



FIG. 1 is a left side elevational view of a cyclist's ribbed helmet showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view of a modified form of the helmet shown in FIG. 1;

FIG. 6 is a top plan view thereof;

FIG. 7 is a front elevational view thereof; and

FIG. 8 is a rear elevational view thereof.

The characteristic feature clause of my design resides in the forwardly elongated ridges, and valleys between the ridges, and the elongated inward openings at the bottom of the valleys, the openings arranged in substantially equal length forward and rearward pairs, the openings being lengthwise tapered and having rounded ends. 

The ornamental design for a cyclist's ribbed helmet, substantially as shown and described. 